Sewing-machine.



mm m 7, 1909. 1. mm'a msn r '1.

W A max SEWING MACHINE. AP PLIUATIUN FILED APR. 18, 190B.

Magma WIA. MACK.

SEWING MAGHINE.

APPLIOATION' FILED APB.1B, 1906.

Patentad Dec.7,19 O9.

4 SHEETS-SHEET 2.

W. A. MACK.

SEWING momma ABPLIUATION FILED APR. 18, 1906.

Patented Dec. 7, 1909.

4 SHEETS-SHEET 4.

WILLIAM A. MACK, OF'CLEVELAND, OHIO, ASSIGNOB, TO OF CLEVELAND, OHIO, ACORP MACHINE COMPANY,

THE STANDARD SEWING ORATION OF OT-H'I)v SEWING-MACHINE.

To all zrfiom it may concern:

lie it known that I, WILLIAM citizen of the United States, of Cleveland,Cuyahoga county, State of Ohio, have invented certain new and use tutImprovements in Sewing-Machines, of which the followingis aspecification.

The invention forming the subject-matter ol my present applicationrelates to sewing machine feeding mechanism of the type (li closed in mypending application, tier. No. 37 395, tiled Nov. 3, .1900, in whichthe'fced of the work is effected by a feeding mechanism comprisingcooperating work-engaging members, one of which is the needle; This typeof feeding mechanism is' desirable in that it assures a uniform,.orsubstantially uniform, feeding movement of a plurality of plies ofmaterial.

The feeding mecha A. M non, a

nism of my said pending application con'iprises the needle, which isoperative to have a combined reciprocating and vibrating movement, andtwo cooperating work-engaging feed-members op if erative at the upperand under sides of the work to engage or grip the work thercbe tween. Asfully disclosed in said pending application, the upper feed-memberis'provided with a needle-hole for the passage of lit) -the needle inits descent; through the work having one wall thereof arranged forenlgemeut with the needle during the work feeding operation to preve orspringing of the needle under anv unto- :45 drag or strain produced bythe engaged work.

bly surface of an.

e cooperating The undue feed -'member is prefera formed with a.work-engaging area at least equal to that of th upper feed--i11einberand is vided with an opening for the passage of the needle, whichopening, in accordance with the invention formingthe subject-matter-ofthe present application, isalso formed with a wall arranged forengagement withthe needle at. its rear side during the feeding operationto prevent undue bending or springing of the same.

lteferringnow to the ings forming part of ti in which like parts'aredesignated by like reference characters,-Figure'1 is a side elevation ofa sewing machine embodying my invention, with the bedplate in section,Fig. 2 is an enlarged front end elevation of the accompanying draw nsspecification, and

nt undue bending accordingly pro- Specification of Letters Patent.Application filed April 18, 1906. Serial No. 312

and a resident t Patented Dec. *2, 1909. ,305.

same with the faceis a vertical section of the machine arm, F 4, alsoshowing a bar. Fig. :t is a horiz the front end of the mach line st--=tof Fig. 3. .l igs'. views of the work-engagin feeding mechanism, partlyin section, showing respectively the position of the parts at or aboutthe beginning and ending of the feeding movement. F 7 and S areenlarget'l plan views of the work-engaging portions of the upper andlower feed members respectively. Fig. 9 is a detail perspective viewillustrating the application of my invention to a two-needle machine.

The sewing machine head or frame comprising the bed-plate 1 and theoverhanging arm 2, the app 1' or main driving shaft 3 supported inbearings in said arm, the lower shuttle driving shaft 4 supported inbearings onthe und er side of the bed-plate and driven from the uppershaft through the medium of operative connections, and

the rotary shuttle 5 driven from said lower shaft 4 through the medium'of an interiediate shuttle-driver, are all substantially as found inthe Standard sewing machine upon which, in the present instance, I haveapplied my improvements.

The lower member of my improved feeding mechanism consists of ahorizontally r ciprocating feed-bar 6 having a projection or dog 7attached thereto which projects through an elongated slot 8 in thethroatplate 9 so as to engage with theunder side of the work. Thisfeed-bar 6 adjacent to its opposite ends is supported and guided withina groove 10 in the under side of the bed-plate as clearly shown in Fig.1, the same resting at one end .upon a roll 11 at tachcd to the frontend of the bed-plate, and at its oppositeend. being pivotal] y connected at Iii-with a short crank-arm 13 on the front end of a rock shaft14 from which it receives its longitudinal movement. The two uppermembers of the feeding mechanism, consisting of the helper-bar 15 havinga foot 16 cooperating with the dog 7 of the lower feed-member ingripping the work or material interposed between the same, and theneedle-bar 17 carrying the needle 18 for entering the work, are-bothloosely supported in hearings in the upper end of the 110 machine armand adjacent to their lower'end passed through a block or gate 19, whichlatter is pivotally connected with a horizontally reciprocatin bar fromwhich the helper and needle bars receive their lateralorfeedingmovement.

- The bar 20 is supported to slide within a seat 21 in the lower end. ofthe machine arm,-

'j as clearly' shown in Fig. 3, and is operated from a cam or eccentric22-011 the upper driving shaft in a manner as follows: A

f lever 23, mounted-on a short shaft 32 journaled in a lug '24 onone'side 'of the machine arm, 1s pivotally block therein which connectswith the inner porting lug end of said stud 26 on the lever 23, and atits upper end is pivotally connected at,30 with theouter ,end'of areciprocating pitman' rod 31 which is connected with and driven by thesaid cam? oreccentric 22 on the driving shaft. By such arrangement ofparts, re; ciprocating movement is communicated to the bar 20 from thedriving shaft 3, and by adjusting the pivot connection or stud 26 backand forth in the slot 25 the length of movement of said bar 20 andthereby the lateral throw of the helper and needle bars may beregulated.

-As a means for operating the lower feedbar 6 in unison with the upperfeed members, the shaft 32 which carries the said lower lever 23is'extended through the sup- 24 and provided on its rear end with, an.arm' 33 rigidly connected therewith, as shown in Fig. 1. The end of thisarm 33 is bifurcated and engages with a roll or block carried by an armat of a rock-shaft 35, which latter is mountedin bearings adjacent tothe opposite ends of the machine and.

provided at its rear end with a second arm 36 which connects, throughthe medium of a 'pitman 37,- w-ith an arm 38 located on the said lowerrock-shaft is, which latter is mounted in bearings on the under side ofthe bed-plate and provided with the arm 13 at itsfront end connectingwith the feedbar 5, as before described. When the lever 23 is operatedfrom the driving'shaft to receive a vibrating movement, its rigidly con-"nectedarm 33 is likewise operated and communicates'a rocking movementto the lower shaft 14 through the medium of theconnections described andso causes the arm 13 at the front end of said shaft to vibrate and givethe feed-bar 6 its horizontal reciprocatin movement. The upper and rowermem ers of the feed being thus operated presser bar,

from the driving shaft through the medium of the-said lever 23, it willbe understood that the one adjustment of the latter caused by theshifting of the stud 26 will. regulate the horizontal throw of both saidupper and lower feed members and cause them to always move in unisonwhatever their length of throw may be.

lhe resser-bar 39 is held, in the usual. manner, with a normal downwardpressure by means of a coiled spring 40 which has a hearing at one endagainst.- a wall of the machine a rm and at its opposite end against ablock ll secured on said prcsscrlmr, as clearly shown. in Fig. 2. Ablock 42 is socured in rigid connection with the helperhar in positionopposite the said block ll. on the presser and is provided with twol'orwardly projecting lugs 4:3, 43, on its l'aco side located one abovethe other. A three armed lever ii is arranged with one arm havingapivotal connection with the pressurbar block 41 hymcans of: apivot-screw 4-5, another arm extending loosely between the said lugs onthe helper-bar block -12, and its third arm being l'iiturcatcd andembracing the lower end of an arm 46 which is secured on the end of ashort shaft t? journuled in hearings in the upper front end of themachine arm 2. This shaft t7, as most clearly shown in F 1 and 3,extends through the arm 2 and is provided at its rear end with a secondrigidly connected arm 48, which latter connects with the inner end ofthe eccentric rod 31 through the medium of a pitman 4:9.

in the operation of the machine, the inner end of the eccentric rod 3ireceives a \cl'llcal or up and down movement which com municatcs arocking movement to the slnll l 47 through the medium oi? theconnections referred to, and so causes a laterally swing ring orVilnnting movement to the lower end of the arm in at the front cud ofsaid rockshul twhich operates the lover il in :1 limitner as willhereinafter be described. Tho prcsser-lmr 39 and hclpenlnu' l5 being opcratively connected lln'oughihc medium of the lever 44: in the mannerdcsul'ilud, it. will be understood that tho prcsscr-lun' spring ll)serves to exert a yielding downward pressure upon the hcl 'ier-bur us\\ull as the vertical mow-nncnt of either one or both of sold ban-sbeing permitted by the sliding coi'incction of the uppcrbiiurcnted endof the lever t-t with the said vibrating arm 46 as shown. in order toraise the helper and presser bars for the purpose of releasing the work,the block 41 on tho presserdmr is adapted to be engaged by .n,

suitable lifting-device in-tlie usual manner, and, by reason of thelever ell-4.- connecting with the blocks on both of said bars and beingguided by the arm 46 which is rendered stationary by the stopping of themachine,

lltl

llfi

the work is secured "both of the helper-bar is caused to be raised andlowered in unison with the pressenbar. Any suitable means might beemployed for raising the presser and helper bars, one means, as hereinshown, consisting of an elbowlever 50 which is pivotally supported uponthe side of the machine at 51 with one end having connection with avertically movable plate 52 which is arranged to slide upon the outerwall of the machine arm and provided with a lower inwardly turned end.53 projecting through an opening in the arm into a position beneath thepresser bar block 39' so as to engage therewith, as clearly shown in1*igr2, and the opposite end of said elbow lever extending downwardthrough an opening in the bed-plate into a position beneath the latterto be operated by any suitable actuating means. The ordinary hand-operated lifting lever, indicated at 54, is also provided, the same asherein shown being adapted to engage with the inwardly turned end 53 ofthe plate 52 in raising the presserbar.

In the operation of the machine. as described, aftcr the work has beenplaced under the regular presser-foot in the usual. manner and themachine set in motion, the presser-foot will be raised from engagementwith the work while the upper feed member or helper-bar with the lowerfeed member and grip the interposed work therebetween preliminary .tothe feeding movement, as shown in Fig. 5. Such action ofthepresser andhelper bars in respectively releasing and engaging in a manner asfollows: The lever l t being rocked by the vibrating arm 46, when thehelper-bar is lowered into gripping engagement with the work and becomes.stattonar the sa d lever is caused to pivot or fulcrum between thelugson the helper-bar block and so raise itsopposite end and theconnected pressenbar. Upon the return 'swingot' said lever,'wh en thepressor reaches a position in engagement with the work, the lever willof course'fulcrum upon the pivot screw 45 in the presserbar block and soraise thehelper-bar. in

this manner, one bar is caused to be brolwht into holding or grippingengagement with the work before the other raises therefrom, the samebein in engagement with the work only as the lever 44 and its actuatingarm 46 move past a central vertical line. To now continue with thefeeding operation of the parts, after the work gripped between the u perand lower gripping members of the 'i'eed as described but before anyforward movement of the some,

the' needle first descends through the work as shown in Fig. 5, assingthrough the needle openings 16 an 7' of the sai upper and lower feedmembers respectively, and,

while in the work and during 1ts movement will be caused to cooperatehas been' to throw out the loop, is moved laterally with the saidgripping members of the feeding mechanism and as a part of the latter tofeed or carry the work forward. After the several members of the feedingmechanism have reached the limit of their feeding movement, as shown inFig. 6, the needle first raises from the work and the presser movesdownward into engagement with the latter, while immediately followingsuch engagement, the helper-bar, "s before described, raises from itsengagement with the work and is swung bzn-k\"ard into position to beagain lowered into gripping engagement. with the work at the startingpoint of the feeding movemen i.

During the described feeding operation of the several cooperatingwm-k-engaging parts of the feeding mechanism, the wall of theneedle-opening in both the upper and under feed members is so formed asto provide a means for engagement with the needle at that side thereofwhich forms the rear side with respect to its direction of feedingmovement, as shown in Fig. (i to prevent the needle being unduly bent orsprung under any drug or strain produced by the engaged work. It will ofcourse be understood. however, that the said noedloopening of both theupper and under feed members is made sufficiently large to permit otvertical passage therein 01' the needle in normal condition withoutfrictional engagement with its walls, as shown in 5; the opening 7 inthe lower feed member being shown in its needle engaging end to'permitol the ready Withdrawal of the thread there through.

As illustrated in 1 to 8 inclusive,

ing machine employing but one needle. In

applied to'a machine employing a plurality of needles, as shown in Fig.9, in which cvenisit is only necessary to provide the cooperatingworkengaging feed members with a, corresponding number of ncedlrpenings, as indicated by 7" and 16 in Fig. 9, having Walls arrangedtocooperate with the needles during the feeding operation in the mannerhereinbefore described. f W hat I claim is:

' 1. In a sewingmaehine a combined reciprocating and vibrating needle,two feed members having work-gripping surfaces opthereof and clamp it;therebetween and 00- operating with'the said needle to effect the feedof the work while the needle is in work, said two feedanembers eachbeing the needle at ing operation, and means for operating said needleand feed members.

my invention as shown applied to a sew-- .erativeto engage the workatopposite sides the provided with means for engagement with its rear sideduring the feedthe present case as open at that end opposite someinstances, however, the" invention is 2. In a sewing machine, a combinedreeiplocating and vibrating needle, two feed members havingwork-gripping surfaces operative to engage the work at opposite sidesthereof and clamp it therebetween and cooperating with the said needleto effect the feed of the work while the needle is in the work, said twofeed members each being provided with a complemental needle-opening, andmeans for operating said needle and feed members.

3. In a sewing machine, a combined recip- 'rocating and vibratingneedle, two feed members having work-gripping surfaces operative toengage the work at opposite sides thereof and clamp it thercbetween and.to

operatingwith the said needle to efiect the feed. of the work while theneedle is in the work, said two feed members each being rovided with acomplemental needle-openmg, means for operating said needle and feedmembers, and adjusting means common to both the said needle and feedmembers for effecting a like adjustment of feed movement to the same.

In testimon whereof I have hereunto set my hand this 13th day of April,1006.

\VILL'LA M A. MAPK. \Vitnesses:

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